CN101378273B - Method for feedback of channel quality indication with periods - Google Patents
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Abstract
The invention provides a method for the periodical feedback of the quality index of a channel, comprising the steps of: determining an effective channel quality index feedback period, feeding the channel quality index of each resource block back to a transmitter at the starting time of the effective channel quality index feedback period after a receiver constructs channel quality index information, and feeding the position information of the resource block which is unavailable at the time back to the transmitter within the effective channel quality index feedback period; wherein, the feedback of the position information of the unavailable resource block means that: the receiver sequentially arranges the position information of all the resource blocks according to sequence to form a data flow which is fed back to the transmitter, 0 of one bit is used for representing the unavailable resource block, and 1 of one bit is used or representing available resource blocks. By adopting the technical proposal of the invention, the contradiction between the channel trueness reflected by the feedback information and the expense brought by the feedback in the prior art can be balanced, namely, the channel information can be more truly reflected by lower expense.
Description
Technical field
The present invention relates to the quality index of a channel in the communications field, be specifically related to a kind of method of feedback of channel quality indication with periods.
Background technology
Quality index of a channel (Channel Quality Indication is referred to as CQI) is the channel condition information that receiver feeds back to transmitter in the communication system.
Transmitter corresponds to certain resource block size, coded system and modulation system with the CQI information that receiver feeds back, and on this basis, transmitter is that receiver carries out Resource Distribution and Schedule according to CQI information.Therefore, the really degree of the CQI information channel that can reflect and the expense of feeding back the up link that consumes all can produce larger impact to systematic function.Yet in fact, the resource that the validity of the channel that CQI information reflects and feedback consume is conflict, if need to reflect as far as possible truly channel, then can take the strategy of unity feedback, namely feed back the channel quality information of each scheduling unit on the whole working band, but this will produce huge expense.For example, for the communication system of a 10M bandwidth, OFDM (the Orthogonal Frequency DivisionMultiplexing that adopts, referred to as OFDM) technology is 600 subcarriers with whole frequency band division, per 24 subcarriers are as a Resource Block, totally 25 Resource Block; Each Resource Block so just needs 25 CQI values to reflect the channel quality of each Resource Block on the whole frequency band as a scheduling unit.
At present, proposed several different methods for the feedback of CQI, mainly contained following several:
(1) average CQI feedback: average CQI value of whole transmission bandwidth internal feedback;
(2) CQI feeds back fully: the CQI value of feeding back all Resource Block in the whole bandwidth;
(3) CQI of the strongest M Resource Block feedback: feed back M maximum CQI value, the positional information of its place Resource Block, and the average CQI value on other Resource Block;
(4) the CQI Mean Value Feedback of a strongest M Resource Block: feed back the average of M maximum CQI value, the positional information of its place Resource Block, and the average CQI value on other Resource Block;
(5) the CQI feedback of the strongest M of a grouping Resource Block: the mode of circulation is adopted in grouping, reports the CQI of M the strongest in one group Resource Block at every turn;
(6) CQI based on discrete cosine transform (DCT) feeds back; At first at receiving terminal channel measured value is carried out dct transform, quantize compression, compressed value is fed back to transmitting terminal, transmitting terminal carries out the DCT inverse transformation to value of feedback again and obtains channel measured value, obtains corresponding CQI value;
(7) based on the CQI of thresholding feedback: the CQI value in the Whole frequency band of measuring based on each receiver, calculate the mean value that is included in the interior CQI value of the highest CQI value and CQI thresholding, the positional information of this average CQI value and these CQI values is fed back to transmitter;
(8) differential CQI feedback: the differential CQI value (1-bit) of at every turn feeding back an absolute CQI value and other Resource Block; Wherein, the calculating of differential CQI bit can be divided into the difference information in calculated rate territory and the difference information dual mode of calculating time domain;
(9) graduation continuous resource piece CQI feedback: whole transmission bandwidth divides some grades, comprises information and the CQI value information of class information, Resource Block in the CQI feedback information;
(10) the discontinuous Resource Block CQI feedback of graduation: comprise bitmap and the CQI value of Resource Block in the CQI feedback information, wherein, bitmap has provided the position of the Resource Block corresponding with the CQI value.
In above-mentioned the whole bag of tricks, method (1) does not possess the advantage of carrying out the frequency selection although the expense that up link is caused is minimum; Method (2) will be brought huge expense to up link although can more accurately reflect channel quality status on each Resource Block; There is certain compensation method (3), (4), (5), (6) to the shortcoming of method (1) and (2), but for the stronger channel of frequency domain selectivity, the quality condition of channel may have larger difference at each Resource Block, therefore use identical CQI value to represent several Resource Block that channel quality differs larger and will produce larger error, cause irrational resource distribution, thereby cause systematic function to descend; And the computation complexity of method (7), (8), (9) is higher.
Summary of the invention
The technical problem to be solved in the present invention provides a kind of method of feedback of channel quality indication with periods, contradiction between the expense of bringing with feedback information was reflected in the balance prior art channel validity and feedback namely reflects channel information more truly with lower expense.
In order to address the above problem, the invention provides a kind of method of feedback of channel quality indication with periods, determine an efficient channel performance figure feedback cycle, in the quality index of a channel from the zero hour to transmitter that feed back each Resource Block of described efficient channel performance figure feedback cycle, and in described efficient channel performance figure feedback cycle, feed back the positional information of this unavailable Resource Block of moment to transmitter after the receiver structure quality index of a channel information.
Further, receiver is judged in the zero hour or described efficient channel performance figure feedback cycle of described efficient channel performance figure feedback cycle according to the current time of the feedback interval reading system of quality index of a channel.
Further, the quality index of a channel of described each Resource Block of feedback is any in the following methods: complete channel performance figure feedback, average channel quality index feedback, the quality index of a channel feedback of a strongest M Resource Block, the quality index of a channel Mean Value Feedback of a strongest M Resource Block, the quality index of a channel feedback of the strongest M of a grouping Resource Block, quality index of a channel feedback based on discrete cosine transform, quality index of a channel feedback based on thresholding, differential channel quality index feedback, graduation continuous resource piece quality index of a channel feedback, the discontinuous Resource Block quality index of a channel of classifying is fed back.
Further, receiver represents with 1 or 0 of 1 bit to the current time of transmitter feedback, and 1 represents the zero hour of described each efficient channel performance figure feedback cycle, is positioned at before the quality index of a channel of each Resource Block of feedback; In the described efficient channel performance figure feedback cycle of 0 expression, be positioned at before the positional information of described unavailable Resource Block of feedback.
Further, the positional information of the unavailable Resource Block of described feedback refers to: receiver is arranged in order the positional information of all Resource Block in order and forms a data flow and feed back to transmitter, represent unavailable Resource Block with 0 of 1 bit, represent available resource block with 1 of 1 bit.
Further, transmitter redefines the quality index of a channel of each Resource Block constantly in the following manner after each feedback is received quality index of a channel:
If the described feedback of A is the zero hour of efficient channel performance figure feedback cycle constantly, then redefine the quality index of a channel of each Resource Block by the method for the feedback of channel quality indication of described employing, and the quality index of a channel of preserving each Resource Block after redefining;
If the described feedback of B is in the efficient channel performance figure feedback cycle constantly, the quality index of a channel that then with described positional information intermediate value is 0 Resource Block sets to 0, and the quality index of a channel of all the other each Resource Block adopts the quality index of a channel of this Resource Block after the redefining that this efficient channel performance figure feedback cycle preserves the zero hour;
The quality index of a channel that basis redefines after redefining the quality index of a channel of each Resource Block is distributed and is dispatched, and this feeds back end.
Further, described efficient channel performance figure feedback cycle is less than or equal to the coherence time of channel or is measuring period.
Further, described unavailable Resource Block be following any: the quality index of a channel of receiver statistics be zero or be lower than Resource Block, the transmitter of setting threshold value think scheduling meeting to this Resource Block cause the insecure Resource Block of transmission, reserved can not be as the difference of the quality index of a channel of zero hour of Resource Block, current time quality index of a channel and this efficient channel performance figure feedback cycle of his usefulness Resource Block above preset standard.
In sum, the invention provides a kind of method of feedback of channel quality indication with periods, take full advantage of the time-varying characteristics of channel, think that within certain time period the variation of channel is not obvious, just length that should the time period is as effective cycle of CQI feedback, only feed back the CQI value of each Resource Block in the zero hour in each cycle, and in the positional information of the unavailable Resource Block of each feedback cycle internal feedback, can reflect more really channel information in the situation that hang down expense like this.
Description of drawings
Fig. 1 is the process chart of the specific embodiment of the invention;
Fig. 2 is the feedback information in the CQI feedback cycle of the present invention;
Fig. 3 is the detailed process chart of application example one of the present invention;
Fig. 4 is the feedback information of the zero hour of feedback cycle in the application example one of the present invention;
Fig. 5 is the detailed process chart of application example two of the present invention.
Embodiment
The present invention proposes a kind of method of feedback of channel quality indication with periods, namely set one-period, think that within this cycle time the variation of channel is not obvious, zero hour in each cycle with prior art in method of any feedback CQI value feed back the CQI value of each Resource Block, and the positional information of unavailable Resource Block is fed back in the compartment of terrain within each cycle time.
The present embodiment relates to a kind of method of feedback of channel quality indication with periods, and as shown in Figure 1, its specific operation process is as described below:
Step 101: receiver is constructed the quality index of a channel information of each Resource Block, the same prior art of its building method;
Quality index of a channel information is that receiver is to the channel condition information of transmitter feedback.And channel condition information comprises: the quantized value of channel quality measurements or statistical value, and the positional information of Resource Block corresponding to measured value.Above-mentioned measured value is following any or its combination: signal noise ratio, signal interference plus noise ratio, signal strength signal intensity, the time selectivity parameter of channel, frequency selectivity parameter.
Step 102: determine effective CQI feedback cycle; Described effective CQI feedback cycle can be the coherence time that is less than or equal to channel, it also can be certain measuring period, as long as can think that within this cycle time the variation of channel is not obvious, concrete value can be decided according to actual conditions, and effectively the calculating of CQI feedback cycle can be:
(1) receiver is directly finished: the coherence time that calculates channel according to its rate travel;
(2) transmitter is finished: transmitter calculates the coherence time of channel according to the rate travel of receiver, and sends the control information that has comprised the feedback cycle size to receiver;
Step 103: receiver is pressed the current time of CQI feedback interval reading system, according to system the requirement of feedback overhead is determined blanking time, such as each feedback interval between the moment of the prior art, if current time is the beginning of effective CQI feedback cycle, then execution in step 104, otherwise execution in step 105;
Step 104: receiver feeds back the CQI value of each Resource Block to transmitter, carry a feedback marks in the described feedback information, being used for this feedback information of sign is the CQI value of each Resource Block or the positional information of unavailable Resource Block, this feedback marks can take 1 bit, is positioned at before the feedback information; Can but be not limited to " 1 " expression feedback cycle the zero hour, inform that namely this feedback information of transmitter is the CQI value of each Resource Block, thereafter enclose the CQI value of each Resource Block of this feedback, receiver can adopt any the CQI value to the transmitter feedback resource block in the following methods:
Fully the CQI feedback of the CQI Mean Value Feedback of the CQI feedback of CQI feedback, average CQI feedback, the strongest M Resource Block, the strongest M Resource Block, the strongest M of a grouping Resource Block, feed back based on the CQI feedback of DCT-M conversion, the CQI feedback based on thresholding, differential CQI feedback, the graduation continuous resource piece CQI discontinuous Resource Block CQI that feeds back, classifies;
Step 105: receiver is inquired about the position of unavailable Resource Block, and the positional information of unavailable Resource Block fed back to transmitter, can but be not limited to represent in the feedback cycle as feedback marks with " 0 " of 1 bit, inform that namely this feedback information of transmitter is the positional information of unavailable resource, encloses thereafter the positional information of this unavailable resource of moment;
Unavailable Resource Block be following any: the quality index of a channel of receiver statistics be zero or be lower than certain Resource Block, transmitter of setting threshold value think scheduling meeting to this Resource Block cause the insecure Resource Block of transmission, reserved can not be as the difference of the CQI value of the effective CQI feedback cycle of the Resource Block of his usefulness, current time CQI value and this zero hour Resource Block above preset standard.
The positional information of feeding back unavailable resource refers to: receiver is arranged in order the positional information of all Resource Block in order and forms a data flow and feed back to transmitter, represents unavailable Resource Block with 0 of 1 bit, represents available resource block with 1 of 1 bit; As shown in Figure 2, if n Resource Block arranged, then can express the position of available resource block and the position of unavailable Resource Block with the number of n bit, greatly saved expense, first Resource Block can be used shown in the figure, second Resource Block is unavailable, and n-1 Resource Block is unavailable, and n Resource Block can be used.
Step 106: transmitter redefines the CQI value of each Resource Block according to the feedback information that receives, method is as follows:
(1) if the feedback marks in the feedback information of receiving is 1 zero hour that expression is certain effective CQI feedback cycle, then the method by selected feedback CQI value redefines the CQI value that each resource is determined, and preserves the CQI value of each Resource Block after redefining;
(2) be in certain effective CQI feedback cycle if the feedback marks in the feedback information of receiving is 0 expression, the CQI value that then with the positional information intermediate value is 0 Resource Block sets to 0, and the CQI value of all the other each Resource Block adopts the CQI value of this Resource Block after the redefining that this effective CQI feedback cycle preserves the zero hour.
Step 107: transmitter carries out Resource Distribution and Schedule according to the CQI value of each Resource Block after redefining, the same prior art of the method for Resource Distribution and Schedule, and this feeds back end.
The below further specifies the present invention with two application examples,
Application example one:
As shown in Figure 3, take the down link of a 10M bandwidth communication systems as example, adopting the OFDM technology, is 600 subcarriers with whole frequency band division, and per 24 subcarriers are as a Resource Block, i.e. scheduling unit, totally 25 Resource Block.The travelling carriage rate travel is 3km/hr, and the feedback interval of CQI is taken as 1ms.Receiver is user terminal (UE), and transmitter is the base station.
Step 201:UE calculates the SINR (Interference+Noise ratio, signal and interference plus noise power ratio) of each Resource Block;
Step 202:UE determines the CQI value corresponding with SINR, and then corresponds to certain modulation coding mode (MCS), and this is the basis that UE feeds back;
Step 203:UE calculates the coherence time of channel according to its rate travel, be 80ms this moment, and with this channel coherence time as effective CQI feedback cycle;
Step 204:UE reads the current time of primary system every 1ms;
Whether effectively step 205:UE judgement current time the zero hour of CQI feedback cycle, if execution in step 206, otherwise execution in step 208;
Step 206:UE is to the CQI value of each Resource Block of base station feedback, the zero hour that represents effective CQI feedback cycle with 1 of 1 bit, thereafter enclose the CQI value of each Resource Block of this feedback, the method that UE adopts complete CQI feedback feeds back to the base station with the CQI value on all Resource Block as the value of feedback in this moment; As shown in Figure 4, CQI value 5 bit transfer of each Resource Block, altogether the CQI value of these 25 Resource Block of need 125 bit transfer.
Step 207: the CQI value of each Resource Block that receives is preserved in the base station, and carries out Resource Distribution and Schedule according to the CQI value on all Resource Block, and this feeds back end;
It is 0 resource block location that step 208:UE calculates CQI value on this moment channel, represent in effective CQI feedback cycle with 0 of 1 bit, enclose the positional information of this unavailable resource of moment thereafter, the positional information that is about to all Resource Block is arranged in order in order data flow of composition and feeds back to the base station, represent unavailable Resource Block with 0 of 1 bit, represent available resource block with 1 of 1 bit; Here the position that only needs 25 bits can express available resource block and unavailable Resource Block.
Step 209: the base station is that the CQI value of 0 Resource Block sets to 0 with resource block location information intermediate value, and the CQI value of all the other each Resource Block adopts the CQI value of this Resource Block after the redefining that this effective CQI feedback cycle preserves the zero hour.
Step 210: Resource Distribution and Schedule is carried out according to the CQI value on each Resource Block that redefines in the base station, and this feeds back end.
Application example two:
As shown in Figure 5, also take the down link of a 10M bandwidth communication systems as example, adopting the OFDM technology, is 600 subcarriers with whole frequency band division, and per 24 subcarriers are as a Resource Block, i.e. scheduling unit, totally 25 Resource Block.The travelling carriage rate travel is 30km/hr, and the feedback interval of CQI is taken as 1ms.Receiver is user terminal (UE), and transmitter is the base station.
Step 301:UE calculates the SINR of each Resource Block;
Step 302:UE determines the CQI value corresponding with SINR, and then corresponds to certain modulation coding mode (MCS), and this is the basis that UE feeds back;
Step 303: the coherence time of channel is calculated in the base station according to the rate travel of UE, be 8ms this moment, as effective CQI feedback cycle;
Step 304: the base station sends control information to UE, wherein writes the information bit of effective CQI feedback cycle;
Step 305:UE reads the current time of primary system every 1ms;
Step 306:UE judges whether it is the beginning of effective CQI feedback cycle, is execution in step 307 then; Otherwise execution in step 309;
Step 307:UE is to the CQI value of each Resource Block of base station feedback, the zero hour that represents effective CQI feedback cycle with 1 of 1 bit, enclose the CQI value of each Resource Block of this feedback thereafter, UE calculates the average CQI value of all Resource Block, and adopts the method for the average CQI value of feedback will this average CQI value to feed back to the base station as the value of feedback in this moment;
Step 308: this average CQI value is preserved in the base station, and the CQI value of each Resource Block all is set to this average CQI value, and then the CQI value that redefines of basis is distributed each Resource Block and dispatched, and this feeds back end;
It is 0 resource block location that step 309:UE calculates CQI value on this moment channel, represent in the feedback cycle with 0 of 1 bit, enclose the positional information of this unavailable resource of moment thereafter, it is 0 resource block location that UE calculates CQI value on this moment channel, the positional information that is about to all Resource Block is arranged in order in order data flow of composition and feeds back to the base station, represent unavailable Resource Block with 0 of 1 bit, represent available resource block with 1 of 1 bit; Here the position that only needs 25 bits can express available resource block and unavailable Resource Block.
Step 310: the base station is that the CQI value of 0 Resource Block sets to 0 with resource block location information intermediate value, the described average CQI value that the CQI value of all the other each Resource Block adopts this effective CQI feedback cycle to preserve the zero hour.
Step 311: Resource Distribution and Schedule is carried out according to the CQI value on each Resource Block that redefines in the base station, and this feeds back end.
Claims (8)
1. the method for a feedback of channel quality indication with periods, it is characterized in that, determine an efficient channel performance figure feedback cycle, in the quality index of a channel from the zero hour to transmitter that feed back each Resource Block of described efficient channel performance figure feedback cycle, and in described efficient channel performance figure feedback cycle, feed back the positional information of this unavailable Resource Block of moment to transmitter after the receiver structure quality index of a channel information.
2. the method for claim 1, it is characterized in that, receiver is judged in the zero hour or described efficient channel performance figure feedback cycle of described efficient channel performance figure feedback cycle according to the current time of the feedback interval reading system of quality index of a channel.
3. method as claimed in claim 2, it is characterized in that, the quality index of a channel of described each Resource Block of feedback is any in the following methods: complete channel performance figure feedback, average channel quality index feedback, the quality index of a channel feedback of a strongest M Resource Block, the quality index of a channel Mean Value Feedback of a strongest M Resource Block, the quality index of a channel feedback of the strongest M of a grouping Resource Block, quality index of a channel feedback based on discrete cosine transform, quality index of a channel feedback based on thresholding, differential channel quality index feedback, graduation continuous resource piece quality index of a channel feedback, the discontinuous Resource Block quality index of a channel of classifying is fed back.
4. method as claimed in claim 2, it is characterized in that, receiver represents with 1 or 0 of 1 bit to the moment of transmitter feedback, and 1 represents the zero hour of described each efficient channel performance figure feedback cycle, is positioned at before the quality index of a channel of each Resource Block of feedback; In the described efficient channel performance figure feedback cycle of 0 expression, be positioned at before the positional information of described unavailable Resource Block of feedback.
5. method as claimed in claim 2, it is characterized in that, the positional information of the unavailable Resource Block of described feedback refers to: receiver is arranged in order the positional information of all Resource Block in order and forms a data flow and feed back to transmitter, represent unavailable Resource Block with 0 of 1 bit, represent available resource block with 1 of 1 bit.
6. method as claimed in claim 4 is characterized in that, transmitter redefines the quality index of a channel of each Resource Block constantly in the following manner after each feedback is received quality index of a channel:
If the described feedback of A is the zero hour of efficient channel performance figure feedback cycle constantly, then redefine the quality index of a channel of each Resource Block by the method for the feedback of channel quality indication of described employing, and the quality index of a channel of preserving each Resource Block after redefining;
If the described feedback of B is in the efficient channel performance figure feedback cycle constantly, the quality index of a channel that then with described positional information intermediate value is 0 Resource Block sets to 0, and the quality index of a channel of all the other each Resource Block adopts the quality index of a channel of this Resource Block after the redefining that this efficient channel performance figure feedback cycle preserves the zero hour;
The quality index of a channel that basis redefines after redefining the quality index of a channel of each Resource Block is distributed and is dispatched, and this feeds back end.
7. the method for claim 1 is characterized in that, described efficient channel performance figure feedback cycle is less than or equal to the coherence time of channel or is measuring period.
8. such as claim 1,4 or 5 described methods, it is characterized in that, described unavailable Resource Block be following any: the quality index of a channel of receiver statistics be zero or be lower than Resource Block, the transmitter of setting threshold value think scheduling meeting to this Resource Block cause the insecure Resource Block of transmission, reserved can not be as the difference of the quality index of a channel of zero hour of Resource Block, current time quality index of a channel and this efficient channel performance figure feedback cycle of his usefulness Resource Block above preset standard.
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| CN102769518B (en) * | 2012-07-16 | 2015-09-02 | 遵义天义利威机电有限责任公司 | Based on the interference alignment techniques of periodicity differential feedback |
| KR20140129623A (en) * | 2013-04-30 | 2014-11-07 | 삼성전자주식회사 | Method and apparatus for determining channel quality in wireless communication system |
| CN106792889B (en) * | 2016-06-15 | 2020-05-15 | 展讯通信（上海）有限公司 | Device and method for scheduling transmission time interval length, communication terminal and base station |
| CN107241147B (en) * | 2017-07-06 | 2019-08-06 | Oppo广东移动通信有限公司 | Radio frequency interference processing method, device, storage medium and terminal |
| CN110167148A (en) * | 2018-02-12 | 2019-08-23 | 大唐移动通信设备有限公司 | A kind of distribution method and device of radio resource |
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| WO2006105004A2 (en) * | 2005-03-30 | 2006-10-05 | Motorola, Inc. | Method and apparatus for reducing round-trip latency and overhead within a communication system |
| CN1921360A (en) * | 2005-08-28 | 2007-02-28 | 华为技术有限公司 | Method for distributing up time-frequency resource |
| WO2007024780A2 (en) * | 2005-08-24 | 2007-03-01 | Interdigital Technology Corporation | Method and apparatus for adjusting channel quality indicator feedback period to increase uplink capacity |
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| WO2006105004A2 (en) * | 2005-03-30 | 2006-10-05 | Motorola, Inc. | Method and apparatus for reducing round-trip latency and overhead within a communication system |
| WO2007024780A2 (en) * | 2005-08-24 | 2007-03-01 | Interdigital Technology Corporation | Method and apparatus for adjusting channel quality indicator feedback period to increase uplink capacity |
| CN1921360A (en) * | 2005-08-28 | 2007-02-28 | 华为技术有限公司 | Method for distributing up time-frequency resource |
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